The combined resistance $R_T$ of two resistors of resistances $R_1$ and $R_2$ connected in parallel is given by the formula: $\frac{1}{R_T}=\frac{1}{R_1}+\frac{1}{R_2}$
Which statement is used in the derivation of this formula?
1 )
The currents through the two resistors are equal.
The potential difference across each resistor is the same
3 )
The supply current is split between the two resistors in the same ratio as the ratio of theirresistances.
4 )
The total power dissipated is the sum of the powers dissipated in the two resistors separately
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